In how far do you think that API calls affect the platform
(in)dependeny of compilers? No C compiler has built-in facilities for
Win32 or other platforms. Support for specific platforms requires
additional libraries, maybe as macro or code libraries, which describe
the usable API functions. It's up to the programmer, which API library
(s)he wants to use.

DoDi
[Microsoft C most certainly has special features to deal with the clumsy
semantics of Win32 DLLs. -John]